Airplane control stick



April 15, 1930. MADORIE 1,755,124

AIRPLANE CONTROLVSTYICK Filed May 22. 1929 2 Sheets-Sheet 1 Till" I I mINVENTOR ATTORNEY April 3 o. H. MADORIE 1,755,124

AIRPLANE CONTROL STICK Filed May 22, 1929 v 2 Sheets-Sheet 2 ATTORNEY v35 plane.

Patented Apr. 15, 1930 UNITED STATES A PATENT orri cs OTTO H. HADORIELDFMARSHALL, MISSOURI AIRPLANE con'rnor. smrci;

Application filed Kay 22, l

- universal pivotal movement,,-whereby the ailerons and the'elevator of.an airplane may be conveniently controlled.

Another object of the invention is the provision of a controllingstick'mounting which has been reduced to a minimum. number of parts, soas to provide for simplicity, stability and'lightness of construction,features which are especially desirable in the construction ofairplanes.

i Another object of the invention is the provision of an adjustablecounterbalance for the stick, which ma be adjusted in accord anceywiththe pull 0 the ailerons and the elevator, so that the stick may beeasily manipulatedand will automatically assume a neutral position inthe event of its release by the aviator. l

With the above and. other objects in view, the invention furtherincludes the following '25 novel featuresand details of construction,-to

be hereinafter more fully described, illustrated in the accompanyindrawings and pointed out in the appende claims. In the drawings Figure 1.is a skeleton\.'perspective view illustrating a control stickconstructed and" mounted in accordance with the present in--. ventionand shown connected for the'control of the ailerons and'the elevator ofan air- Figure 2 is a fragmentary side'elevation. Figure 3 is a top planview. Figure 4 is a section taken substantially on the line 4-4 ofFigure 3. v Figure 5 is an enlarged fragmentary sectional Eview takensubstantially-on the-line 5.5 of Figure 3 with arts in section.

Referring to the drawings in detail wherein like characters of referencedenote corre sponding parts, the reference character 10 indicatesasupporting frame which is adapted to bemounted rigid with the frame ofthe airplane. This frame 10 supports a shaft 11 which is disposedtransversely of the air- 5 0 plane and which has mounted thereon a 1929.Serial No. 865,135.

sleeve 12. This sleeve is capable of rocking movement upon the shaft 11and is held against a xial movement by means of collars 13 whichareadjustably secured to the shaft by means of set screws 14, Thecontrol stick is indicated at l5-and is provided intermediate its endswith an offset portion 16. In addition, the stick 15 has secured theretoa' substantially U-shaped strap 17 whose ends are/secured to the stickadjacent the ends' of the ofi'set portion 16, by means of bolts v18. Arectangular frame is thus provided in the stick through which-the.sleeve 12 asses.

Extend ng diametrically f rom the sleeve 12 are bosses 19'. These bossesabut the 0p osed' faces of the frame whichis formed ythe offset portion.16 and the strap 1'2. Trun-nions 20 provide a pivotal connectionbetween the stick frame and the sleeve12, the trunnions consisting ofbolts having relatively .lar e smooth bearin portions upon which thelame may be 'roc ed and thread ed ortions which enter the bosses 19.

rom theforegoing description and accompanyingdrawin s it will be seenthat the stick 15 is capableo universalpivotalmovement.

In Figure 1 of the drawings, the ailerons of an airplane are indicatedat 21 and these ailerons are connected to'the stick 15 above and belowthe ivotal mountin of the stick by means of ca les 22, so that w enthestick is rocked laterally, the ailerons willbe moved pivotally.In.addition,thestick is connected as to an elevator 23 by meansof cables24 which are also connected to the stick above" and be-' low itspointof'pivotal mounting, so that when the stick is rocked forward orrearward, the elevator will be adjusted for ascent or descent.

Mounted upon the stick 15 below its point of pivotal mounting is aweight 25. This weight is adjustablly secured upon the stick by means ofa bin 1 erly adjusting the weight upon the, stic the latter may bebalanced with respect to the ailerons and elevator, so that in theeventthe aviator releases his hold upon the stick, the latter willassume a neutral position with :10

ng screw 26. Byrop- "us the ailerons and elevator neutral. This actionwill materially aid in the safety of the airplane.

he invention is susceptible of varlous changes in its form, proportionsand minor details of construction and the right is herein reserved tomake such changes as properly fall within the scopeof the appendedclaims. Having described the invention what is claimed 1s:-

1. In a control stick for airplanes, a shaft disposed transversely ofthe airplane, a sleeve mounted for rocking movement upon the shaft, acontrol stick, an offset portion provided in said stick, a substantiallyU- shaped strap having its opposite ends secured to the stick at theends of the offset portion and cooperating with the latter to provide aframe for the passage of the sleeve, means to pivotally secure the stickframe to diametrically opposite sides of thefisleeve and means toconnect the stick with the ailerons and elevator of the airplane.

' 2.;In a control stlck for airplanes, a sta I tionar supporting frame,a shaft secured in,

said 'ame, a sleeve mounted for rocking movement upon the shaft, acontrol stick, an ofi'set portion provided in said stick, asubstantially U,-shaped strap having its opposite ends removablsecured-to the stick at the ends of the 0 set portion and cooperatingwith the latter to provide a frame for the passage of the'sleeve, headedtrunnions extending through and having hearings in said frame andthreadedly engaging the-sleeve to pivotally secure the stick frame todiametrically opposite sides of the sleeve, and means to connect thestickwith the ailerons and elevatorof the airplane. i

40 In testimony whereof I aifix my signature.

,. o'r'ro H. MADORIE.

